1 /* Test of flock() function.
2 Copyright (C) 2008-2009 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "signature.h"
22 SIGNATURE_CHECK (flock, int, (int, int));
30 #define ASSERT(expr) \
35 fprintf (stderr, "%s:%d: assertion failed, errno = %d\n", \
36 __FILE__, __LINE__, errno); \
44 test_shared (const char *file, int fd)
46 /* Should be able to acquire several shared locks on a file, through
47 * different file table entries.
51 ASSERT (flock (fd, LOCK_SH) == 0);
53 fd2 = open (file, O_RDWR, 0644);
56 r = flock (fd2, LOCK_SH | LOCK_NB);
57 ASSERT (r == 0); /* Was able to acquire a second shared lock. */
59 ASSERT (flock (fd, LOCK_UN) == 0);
60 ASSERT (close (fd2) == 0);
64 test_exclusive (const char *file, int fd)
66 /* Should not be able to acquire more than one exclusive lock on a file. */
69 ASSERT (flock (fd, LOCK_EX) == 0);
71 fd2 = open (file, O_RDWR, 0644);
74 r = flock (fd2, LOCK_SH | LOCK_NB);
75 ASSERT (r == -1); /* Was unable to acquire a second exclusive lock. */
77 ASSERT (flock (fd, LOCK_UN) == 0);
78 ASSERT (close (fd2) == 0);
82 main (int argc, char *argv[])
85 const char *file = "test-flock.txt";
87 /* Open a non-empty file for testing. */
88 fd = open (file, O_RDWR | O_CREAT | O_TRUNC, 0644);
90 ASSERT (write (fd, "hello", 5) == 5);
92 /* Some impossible operation codes which should never be accepted. */
93 ASSERT (flock (fd, LOCK_SH | LOCK_EX) == -1);
94 ASSERT (errno == EINVAL);
95 ASSERT (flock (fd, LOCK_SH | LOCK_UN) == -1);
96 ASSERT (errno == EINVAL);
97 ASSERT (flock (fd, LOCK_EX | LOCK_UN) == -1);
98 ASSERT (errno == EINVAL);
99 ASSERT (flock (fd, 0) == -1);
100 ASSERT (errno == EINVAL);
102 test_shared (file, fd);
103 test_exclusive (file, fd);
105 /* Close and remove the test file. */
106 ASSERT (close (fd) == 0);
107 ASSERT (unlink (file) == 0);